Dr. Melissa Gans practices Pediatric Allergy Medicine in MIAMI, FL. A pediatric allergist/immunologist finds and treats allergies and immune system problems that child patients suffer from. Dr. Gans treats the reactions caused by pet dander, pollen, dust, mold spores, insect stings, food, and medications; those reactions include asthma, hay fever, hives, eczema, or a very severe and unusual reaction called anaphylaxis.